For anybody looking to play Nightreign on offline LAN or VLAN (like zerotier), without steam, here is a Goldberg emu (GBE_Fork) setup:

The following was tested with the game files from AR-81 on page 1 (ELDEN RING NIGHTREIGN v.1.01).

1. Copy the files in the archive attached to this post into the ELDEN RING NIGHTREIGN\Game folder along with the seamless co-op mod files ( SeamlessCoop folder and nrsc_launcher.exe)
2. Make sure that you've allowed firewall access to nightreign.exe on all PCs that you wish to play on
3. Under steam_settings\configs.user.ini change the account_steamid to be unique for each player (changing the last digit for each person usually works) and the account_name
4. Use steamclient_loader_x64.exe to start the game.

EDIT: Added controller support, thanks to dudisuper6 for the idea!

This method does NOT work on linux (tested on fedora 42 with GE-Proton10-3)
